Build quality could be better. Even when everything is tightened really hard, they still wiggle a bit and can end up slightly off angle (crooked). You should also know that these mounts clamp on to the sides of a "flat" square/rectangle shaped desk. The sides of my desk aren't flat. They're angled 45 degrees for aesthetics, so the clamp mechanism that's included doesn't have much to grip onto. I solved this buy placing a metal plate underneath the table and clamped onto the metal plate as a layer in between, providing good pressure. Once installed they are stable and carrying my Yamaha HS8. However, I wish the stand could be shortened. My desk is already quite high and now the HS8 tweeter is well above my head in mixing position.